89979 has 8 divisors (see below), whose sum is σ = 121680. Its totient is φ = 59136.

The previous prime is 89977. The next prime is 89983. The reversal of 89979 is 97998.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 89979 - 2¹ = 89977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 89979.

It is not an unprimeable number, because it can be changed into a prime (89977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99 + ... + 435.

It is an arithmetic number, because the mean of its divisors is an integer number (15210).

2⁸⁹⁹⁷⁹ is an apocalyptic number.

89979 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

89979 is a deficient number, since it is larger than the sum of its proper divisors (31701).

89979 is a wasteful number, since it uses less digits than its factorization.

With its successor (89980) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (429).

89979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429.

The product of its digits is 40824, while the sum is 42.

The square root of 89979 is about 299.9649979581. The cubic root of 89979 is about 44.8105616574.

The spelling of 89979 in words is "eighty-nine thousand, nine hundred seventy-nine".